Utility knife



FIG. 1 is a top plan view of a utility knife showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a front end elevation view thereof in the direction of arrows5--5 in FIG. 4; and,

FIG. 6 is a back end elevation view thereof in the direction of arrows6--6 in FIG. 4.

The ornamental design for a utility knife, as shown and described.